研究表明，笑对身体有利。请根据以下要点，用英语写一篇以Laughing is good for health为题的短文。笑的好处：
1. 忘却烦恼和忧愁, 减轻痛苦
2. 保持良好的心情, 对生活保持积极的态度；
3. 易交友；
4. 活得更长久和更有活力。
注意：可根据要点适当发挥，或增加其他观点，使文章自然流畅。
词数：120左右。
第一句已经给出

参考范文

Laughing is good for health

     Many studies show that laughing is good for our health, and I have the same opinion. The reasons are as follows. First, laughing can help us forget about worries and anxieties and keep us in a good mood, so that we will have a positive attitude toward life. Second, laughing can even help reduce pain, making us feel more comfortable. Third, if you often laugh or smile at people around you they will think you are friendly, which is helpful in making more friends. Last, doctors have discovered that people who laugh a lot are healthy and live longer. In fact, laughing is a means of exercise. So I think if we want to enjoy a longer and more active life, we should set aside our worries and laugh often.